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FELIX A. FINN, 0E NEW YORK, N. Y.

CHIMNEY-CAP.

Specification of Letters Patent No.

To all whom 25 may concern.'

Be it known that `LFELIX A. FINN, of the city, county, and State of NewYork, have invented newl and useful improvements in chimney caps toprevent smoking either from the want of draft or from currents blowingdown the lues of chimneys, and which may be used as a ventilator, andthat the following is a full, clear, and exact description of theprinciple or character whichv distinguishes them from all other thingsbefore known 'and of the manner of making, constructing, or using thesame, reference being had to the accompanying drawings, making part ofthis specification, in which- Figure l is aperspective view of myimproved chimneycap, and F ig. 2 a vertical section thereof.L

The same letters indicate like parts inthe n two igures.

' Chimneys smoke from one of three causes, viz, either because thesupply ofair to the room through lplaces other than the flue is notsutlicient to supply combustion and the rarification, or from externalcurrents blowing down the chimney with a force greater than t-he upwardforce of the draft produced by rariication, or, because of apreponderating'upward current in some other part of the house which willdraw its supply from downward currents in yanother flue or flues. Thefirst part of'these is proved by the practice often resorted to ofopening a door or window to give draft to a chimney, which will nototherwise draw. The second by the pnffs of wind descending` the chimneywhich often not only blow the smoke but sometimes even ashes into theroom. And t-he last by making -tire in two rooms of unequal size or onehaving tight windows and doors and the other loose, with an open doorcommunicating between the two, in either of which cases one chimney willdraw its supply of air from the other, causing a downward currenttherein which prevents the smoke and other products of combustion `fromrising. The object of my invention is to remedy these evils.

The first part of my invention is based on the well known fact that anupward and a downward current of air can be produced in a tube byrarification, the circulation being kept up byv the continuedrarification, and consists in'using a partition at. the top of the flue,and descending to any extent desired, which partition will separate oneside 5,962, dated December 12, 1848.

ofthe chimney from theI other that the v vdownward current to supply thecombustion and the current produced by rarificationmay `at the start beseparate, the tendency of these currents being to continue separate whenonce started; the partition having the effect at the same time toprevent the smoke 1 at the top of the chimney from mingling with the airthat supplies the downward current; And the second part of myi'nvenf`tion consists-in providing the chimney can with apertures on t-wooppositev sides, when combined with curved partitions so arranged thatcurrents which blow into these apertures will be deflected upward and inpassiing upward will tend, to exhaust the iiues of the chimney, or whenblowing down the chimney shall be deflected and carried outv y throughthe side aperture instead of passing down theflue, the upward currentfrom the tire being free at the same time to pass out without anyinterruption from such blasts of air.

In the accompanying drawings (a) represents a square metal chimney capon a Chim ney flue (b). The flue in this cap is divided into two equalparts by a partition which is vertical for a shortl distance, and isthen extended to the top by a double ogee curve, the upper end beingthen curved down to present a semi-cylindrical curve (c) at the top ofthe chimney cap. The two sides 0f the sovv cap which are parallel withthe lower part of the partition are each made with two apertures (CZ,cZ,) and (e, 6,) provided outside with sloped flanches (f) to gather inthe currents of wind, and to the lower and inner edges of each isattached a wing (g g g2 g3) curved to correspond with thecurves of theo. g. part of the middle partition so that the upper edge of the `upperone on the left hand side in the figure shall be about vertically belowthe turned down edge of the middle partition with space sufficientbetween them for the passage of the draft, that if it (the draft) shouldbe struck by a downward current of wind the whole will y be carried outof the upper lateral aperture, and if by any possibility a portion ofthe draft should be carried down below this ture. The wings (g2) and(g3) of the two apertures on the rightJ side are located in acorresponding manner on the right hand side ofthe cap and have the sameeffect when a current blows down that sideof the cap. When a current ofwind blows vinto these side apertures it is deflected and carried upward4and passing by the apertures of the lues formed between the wings andthe curved surface of the middle vpartition exhausts the flue on thatside of the partition in which the currentblows, the draft on the otherside being free to pass out or in as the draft in the chimney mayrequire.

I wish it to be understood that the number of curves in the middlepartition and the number of lateral openings and wings may be increasedor diminished without changing the principle of my invention, althoughthe number represented in the drawing is deemed the best. And that thefirst part of my invention can be used without the second and produce agood eiect in Curving the partition in manner substany tially asdescribed, in combination with the lateral openings and wings in thesides of the chimney caps, `as described, that blasts of wind blowing inthrough the lateral apertures may tendrto exhaust the flue and aid thedraft, and by means of which also, downward blasts of wind shall'beprevented from passing down the chimney flue as described.

FELIX A l FINN.

Witnesses: Y

ALEXR PORTER BROWN,

C. W. M. KELLER.

